K.A. Vanaja

Sathyabama Institute of Science and Technology

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M. K. Jayaraj

University of Calicut

R. S. Ajimsha

Raja Ramanna Centre for Advanced Technology

N Selvakumar

Anna University, Chennai

Sivaraj Anbarasu

Sathyabama Institute of Science and Technology

A.S. Asha

Cochin University of Science and Technology

Janet Tate

Oregon State University

Joseph Jerrine

Sathyabama Institute of Science and Technology

A. D. Draeseke

Oregon State University

R Prabhakar

Kerala Veterinary and Animal Sciences University

P. M. Aneesh

Central University of Kerala

Cooperative Institutions

Cochin University of Science and Technology

Oregon State University

Universitat de València

Homi Bhabha National Institute

Indian Council of Medical Research

National Institute of Research in Tuberculosis

Bhabha Atomic Research Centre

Raja Ramanna Centre for Advanced Technology

Sathyabama Institute of Science and Technology

University College London

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Transportation of lymph node biopsy specimens in selective Kirchner's liquid medium for culture of tubercle bacilli

Journal of Medical Microbiology (1997)

K.A. Vanaja N Selvakumar M S Jawahar Kaushik Rajaram C N Paramasivan

Lymph node biopsy specimens, obtained from 297 paediatric and adult patients with tuberculous lymphadenitis at Madurai, were transported in selective Kirchner's liquid medium (KL-T) to the Tuberculosis Research Centre, Madras and processed for culture. Mycobacterium tuberculosis was isolated from 201 (68%) specimens. Of the 192 specimens received within 4 days of resection, 134 (69.8%) yielded M. tuberculosis on culture and of the 105 specimens received after 5 days, 67 (63.8%) were culture positive; the difference was not statistically significant. By incubating KL-T alone further, after removing the gland for processing, it was found that mere contact with the excised node during transportation was enough to retrieve 77 (38.3%) of the total of 201 positive isolates obtained, the delay did not affect the culture positivity rate. Thus, lymph node specimens for culture of tubercle bacilli can be stored in the refrigerator for up to 15 days and transported in KL-T at ambient temperature for 18-20 h without any loss in culture positivity.

Tubercle

Liquid culture

Lymph node biopsy

10.1099/00222615-46-3-260

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Citations (9)

Transition path to a dense efficient-packed post-delafossite phase. Crystal structure and evolution of the chemical bonding

Journal of Alloys and Compounds (2021)

Raquel Chuliá-Jordán David Santamarı́a-Pérez Julio Pellicer‐Porres Alberto Otero‐de‐la‐Roza D. Martínez‐García

AIBIIIO2 delafossite-type oxides are important technological compounds characterized by the linear coordination of the monovalent A metal by oxygen atoms. Based on results of in situ synchrotron X-ray diffraction measurements and ab initio calculations, we herein report on the high-pressure behavior of AgGaO2, to the best of our knowledge the first compound showing step-wise transitions of Ag coordination from linear (2) to octahedral (6), through a leaning delafossite structure. These transformations take place at ~10.5 and ~16.5 GPa, respectively. Our structural analysis evidences that the initial rhombohedral delafossite structure first becomes dynamically unstable, and distorts continuously via a gliding motion of the [GaO2] octahedral layers within the ab plane, and subsequently transform into another rhombohedral phase 8% denser. This structural sequence is associated with a simultaneous decrease in the bond order of the Ag‒O bonds and an increase in the ionicity of the crystal. These results may help to unveil the high-pressure phases of several delafossite compounds which were reported to undergo phase transitions under compression that could not be identified.

Delafossite

10.1016/j.jallcom.2021.159012

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Citations (3)

One-Dimensional ZnO Nanostructure: Growth & Device Applications

Materials horizons (2020)

L. S. Vikas K.A. Vanaja M. K. Jayaraj

Wide-bandgap semiconductor

10.1007/978-981-15-3314-3_6

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Citations (1)

Effect of oxygen intercalation on properties of sputtered CuYO2 for potential use as p-type transparent conducting films

Bulletin of Materials Science (2008)

R. Manoj M. S. Nisha K.A. Vanaja M. K. Jayaraj

10.1007/s12034-008-0009-1

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Citations (26)

Nuclear quadrupole resonance studies of transparent conducting oxides

Solid State Nuclear Magnetic Resonance (2004)

W. W. Warren A. Rajabzadeh T. Olheiser J. Liu Janet Tate

Delafossite

Quadrupole splitting

10.1016/j.ssnmr.2004.03.008

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Citations (8)

Transparent p-AgCoO2/n-ZnO diode heterojunction fabricated by pulsed laser deposition

Thin Solid Films (2007)

R. S. Ajimsha K.A. Vanaja M. K. Jayaraj Pankaj Misra V. K. Dixit

Pulsed Laser Deposition

Deposition

10.1016/j.tsf.2007.03.002

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Citations (63)

In vitro antitubercular activity of Tridax procumbens extracts against whole cell Mycobacterium tuberculosis and its lysine aminotransferase

DOAJ (DOAJ: Directory of Open Access Journals) (2016)

Rajasekar Thirunavukkarasu Sivaraj Anbarasu M Radhakrishnan Joseph Jerrine K.A. Vanaja

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Synthesis of ZnO nanoparticles by hydrothermal method

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2007)

P. M. Aneesh K.A. Vanaja M. K. Jayaraj

Stable, OH free zinc oxide (ZnO) nanoparticles were synthesized by hydrothermal method by varying the growth temperature and concentration of the precursors. The formation of ZnO nanoparticles were confirmed by x-ray diffraction (XRD), transmission electron microscopy (TEM) and selected area electron diffraction (SAED) studies. The average particle size have been found to be about 7-24 nm and the compositional analysis is done with inductively coupled plasma atomic emission spectroscopy (ICP-AES). Diffuse reflectance spectroscopy (DRS) results shows that the band gap of ZnO nanoparticles is blue shifted with decrease in particle size. Photoluminescence properties of ZnO nanoparticles at room temperature were studied and the green photoluminescent emission from ZnO nanoparticles can originate from the oxygen vacancy or ZnO interstitial related defects.

Selected area diffraction

Hydrothermal Synthesis

Wide-bandgap semiconductor

10.1117/12.730364

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Citations (224)

p -type electrical conduction in α-AgGaO2 delafossite thin films

Applied Physics Letters (2006)

K.A. Vanaja R. S. Ajimsha A.S. Asha M. K. Jayaraj

Thin films of delafossites of α-AgGaO2 were prepared on α-Al2O3 (0001) and on Si (100) single crystal substrates by pulsed laser deposition. The films have a band gap of 4.12eV and a transparency of more than 50% in the visible region. The electrical conductivity at 300K was 3.2×10−4Scm−1. The positive sign of Seebeck coefficient (+70μVK−1) demonstrated the p-type conduction in the films. Transparent p-n heterojunctions on a glass substrate having a structure glass/ITO∕n-ZnO∕p-AgGaO2 were fabricated. The ratio of forward to reverse current was more than 100 in the range of −2to+2V.

Delafossite

Pulsed Laser Deposition

10.1063/1.2204757

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Citations (41)

p-Type oxides for use in transparent diodes

Thin Solid Films (2002)

Janet Tate M. K. Jayaraj A. D. Draeseke T. Ulbrich A.W. Sleight

Delafossite

10.1016/s0040-6090(02)00199-2

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Citations (200)